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(a) How long does it take a car to cross a 30.0 m wide intersection after the light turns green ,
If the car accelerates from rest at a constant of 2.00 m/s^2?
(b) A car starts from rest and accelerates uniformly over a time of 5.21 s
for a distance of 110 m .determine the acceleration of the car.
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(a) Use the formula for a distance at uniformly accelerated rectilinear movement
D = , (1)
where D is the traveled distance, "a" is the acceleration, t is the time.
Substitute given values into the formula D = 30 m, a = 2.00 m/s^2
30 = .
You have an equation for time t. Express t
t^2 = = 30; t = = 5.48 seconds.
ANSWER. 5.48 seconds.
Solved.
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Solve your second problem similarly, starting from the same formula (1).
Or post your second problem separately.
Never pack more than problem per post. It is a rule of this forum.